The principle of design that is not typically represented in a scene like the one described (a street in Ukraine painted in watercolor with a car in the center and buildings on each side) is radial balance.
Radial balance involves elements radiating from a central point, which does not seem to apply in this case where the composition is more linear with elements placed along a street. The other principles mentioned (variety, proportion, and perspective) can be effectively illustrated in the described scene.